Titanium alloys are highly resistant to aggressive environment, possess high strength and have lightweight as well as exceptional fatigue endurance. Even with excellent properties, in the industrial scenario, titanium alloys are considered as one of the difficult-to-cut materials. Therefore, a hybrid lubrication/cooling environment is proposed by combining minimum quantity lubrication (MQL) and cryogenic environments for turning of Ti-6Al-4V alloys at heavy machining conditions. Cryo-MQL includes simultaneous application of MQL and liquid nitrogen from two different nozzles at the machining region for better lubrication and cooling. Feed and cutting forces, workpiece surface roughness and microhardness, sliding-sticking regions contact length and tool morphology was assessed for three distinct lubrication/cooling environments; dry, MQL, and cryo-MQL. The assessment indicates a significant improvement in machining performance; cryo-MQL environment shows reduction in machining forces and workpiece surface roughness by 27 % and 46 % over dry environment. Morphology of the tool rake surface shows significant reduction in sliding-sticking regions contact length. Elemental composition confirms the reduction of workpiece material adhesion on the tool rake surface compared to dry and MQL environment.

钛合金对侵蚀性环境具有很高的抵抗力，强度高，重量轻，并具有出色的耐疲劳性。即使具有优异的性能，在工业应用中，钛合金也被认为是难以切割的材料之一。因此，提出了一种混合润滑/冷却环境，该方法通过组合最小量润滑（MQL）和低温环境来在重加工条件下车削Ti-6Al-4V合金。Cryo-MQL包括在加工区域同时使用来自两个不同喷嘴的MQL和液氮，以实现更好的润滑和冷却。针对三种不同的润滑/冷却环境，评估了进给和切削力，工件表面粗糙度和显微硬度，滑动粘着区域的接触长度以及刀具形态。干，MQL，和cryo-MQL。该评估表明加工性能有了显着提高；在干燥环境下，cryo-MQL环境显示出加工力和工件表面粗糙度分别降低了27％和46％。刀具前刀面的形貌表明，滑动粘着区的接触长度明显减小。与干燥和MQL环境相比，元素成分可确认工件材料在刀具前刀面上的附着力降低。